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8.5 Trouble shooting
Fans do not start
1. Check that main supply gets to the unit.
2. Check that all connections are working (all connections in terminal box
and fast couplings of supply and extract air fans).
3. If only the supply fan is switched off and if the external temperature
is below zero, maybe the no-frost thermostat is activated: wait until the
thermostat is deactivated.
Reduced airflow
1. Check setting of fan speed in the terminal box or on the remote controls.
2. Check filters. Change of filters required?
3. Check diffusers. Re-setting or cleaning of grilles and diffusers required?
4. Check fans and heat exchange block. Cleaning required?
5. Check if air intake and exhaust have been clogged.
6. Check ducting system for damage and/or dirt accumulation.
Fan noise/vibrations
1. Clean fan impellers. Cleaning required?
2. Check that the fans are firmly in place within the unit.
Excessive air noise
1. Check setting of fan speed in the terminal box or on the remote controls.
2. Check grilles and diffusers. Re-setting or cleaning of grilles and diffusers
required?
Gurgling noise
1. Drainage pats have not been installed correctly.
2. Drainage connections below the unit has a too low water level, fill it up
with water.
Unpleasant smell
1. Drainage pats have not been installed correctly.
2. Drainage connections below the unit has a too low water level, fill it up
with water.
3. Check filters . Change of filters required?
4. Check ducting system and grilles and diffusers. Cleaning required?
Water leakage near the unit
1. Drain connections and elbows/plugs have not been installed correctly.
You need to check it?
2. Drain connections and elbows/plugs are dirty. Cleaning necessary?
Fig. 8.s
• Clean the fans every year with a vacuum cleaner. The actual need to perform this operation may vary depending on indoor and outdoor ambient conditions.
and on frequency of filter cleaning. Do not move the motor balance clips (Fig. 8.g-n-o-s).
